“You can’t refuse one of the best clubs in the world and the best coach in the world. But my wife and my three-year-old child cried when we left Lisbon.

“But in London I feel really great. I’m also working with a great manager, everybody knows that Jose Mourinho is a fantastic coach. Now I’m training under him every day I just must agree, he really is fantastic.”

Matic will miss Chelsea’s Champions League tie with PSG, as he is ineligible to play in Europe, having already played for Benfica this season.

However, the Serbian is making the most of his chances in the Premier League, and should Chelsea win the title come May, his purchase could prove to be one of the top signings of the season.